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The forms are on different domains, different servers, different databases. Let me give a example, suppose I want to copy my credit card information from 1 form to a random site where I am shopping.

You would never want to do that, since it poses too much of a security risk. Anyone could sit down at your computer and either use your number, or steal it and leave. And I wouldn't want the liability of being the developer that made the software that led to people's cards being stolen.

If you really meant to say less risky information like name and address.. there are a bazillion browser extensions for filling in those fields automatically.

I had a program ("had" because I do not know where it is now?).
The program runs minimized.
Each time I made a copy (ctrl c) of a text, the program grasped it and put it into an accumulator.
After some time having collected some text, it was possible to put the textaccumulators content (ctrl v) to any other text place on any screen.

This is only a solution to a related problem, hoping that other ideas can come up.